ADDITIONAL SYSTEM INFORMATION :
Firefox 68.0.2 (64-Bit)

A DESCRIPTION OF THE PROBLEM :
When searching for a method with many parameters and your browser window is not wide enough, the search result dialog gets an horizontal scrollbar to allow seeing the complete result. However, it appears the headers in the results (e.g. "Members") and the light blue hover outline of results do not take up the complete horizontal space.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
1. Open any javadoc page, e.g. https://docs.oracle.com/en/java/javase/12/docs/api/java.base/java/lang/Object.html
2. Type / paste the name of a method with many parameters in the search field, e.g. "XMLEventFactory.createStartElement"
-> You should see a horizontal scrollbar for the result dialog (if not, decrease the width of your browser window)
3. Scroll to the right

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
The blue "Member" header and the light blue / gray hover selection boxes take up the complete horizontal space
ACTUAL -
The header and the hover selection boxes are cut off